"It is an especially thrilling year to march this year," said longtime LGBT activist Cathy Renna. "I have seen more real progress in the past three years than the nearly two decades of activism before it."

Supporters of California's Proposition 8 ban on same-sex marriages lost another argument Sunday when Supreme Court Justice Anthony Kennedy turned down their request to at least temporarily bar such marriages in the state.

The Associated Press and Reuters report that Kennedy denied the petition "with no additional comment."

On Thursday, the court (with Chief Justice John Roberts writing the majority opinion), ruled 5-4 that the proponents who came forward to defend Prop 8 after it was struck down by a lower court did not have the proper standing to bring the case to the High Court. So, in effect, the lower court ruling was allowed to stand.

The ruling has brought hundreds of same-sex couples to courthouses and city halls across California. As we wrote Saturday, it's "wedding weekend in San Francisco" and other places.

This weekend, Kennedy (to whom appeals of decisions from California are directed) was asked to put a stop to the weddings. Prop 8's supporters, as our colleagues at KQED reported, argued that because they have 25 days in which to ask the Supreme Court to reconsider its ruling, the marriages should be on hold for at least that long.

Kennedy disagreed. So, the marriages can continue. San Francisco's city hall will be among the places set to be open all Sunday for the ceremonies.

Meanwhile, previously scheduled gay pride marches are happening Sunday in cities across the nation. In New York City, the AP says, "the 84-year-old woman at the center of the U.S. Supreme Court decision granting gay couples federal marriage benefits is a grand marshal of New York City's gay pride march. Edith Windsor plans to walk up Fifth Avenue starting at noon Sunday."

Update at 4:30 p.m. ET. Some Gay Pride Headlines From Around The Nation: